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<?php
$arr = array(1,2,3);
setcookie('a',$arr);
$arr = array(1,2,3);
setcookie('a',$arr);
?>
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//´æÈë  
$arr = array(1,2,3);  
$arr_str = serialize($arr);    
setcookie("a",$arr_str);  
 
//È¡³ö  
$arr_str = $_COOKIE['a'];  
$arr = unserialize($arr_str); 
//´æÈë
$arr = array(1,2,3);
$arr_str = serialize($arr);
setcookie("a",$arr_str);
//È¡³ö
$arr_str = $_COOKIE['a'];
$arr = unserialize($arr_str);
 
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$arr = array(1,2,3);  
setcookie("a[0]", $arr[0]);  
setcookie("a[1]", $arr[1]);  
setcookie("a[2]", $arr[2]); 
$arr = array(1,2,3);
setcookie("a[0]", $arr[0]);
setcookie("a[1]", $arr[1]);
setcookie("a[2]", $arr[2]);
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Array ( [0] => 1 [1] => 2 [2] => 3 )
 
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$arr = array(1,2,3);  
setcookie("a[]", $arr[0]);  
setcookie("a[]", $arr[1]);  
setcookie("a[]", $arr[2]); 
$arr = array(1,2,3);
setcookie("a[]", $arr[0]);
setcookie("a[]", $arr[1]);
setcookie("a[]", $arr[2]);
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Array ( [0] => 3 )